Metal-coating tank.



No. 792,610. i PATENT-LED JUNE 20, 1905. G. PORTER.

METAL COATING TANK.

APPLICATION FILED JUNE 1, 1904.

v WITNESSES: I INVENTOR 0$ @flzm ATTORNEY NTTE STATES Patented June 20, 1905.

GEORGE PORTER, OF SAN FRANCISCO, CALIFORNIA.

METAL-COATING TANK.

SPECIFICATION forming part of Letters Patent No. 792,610, dated June 20, 1905.

Application filed June 1, 1904- Serial No. 210,700.

To all 1071 0771 it may cone/37%.-

Be it known that I, GEORGE PORTER, a citizen of the United States of America, and a resident of San Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Metal-Coating Tanks, of which the following is a specification.

This invention relates to metal coating tanks; and its object is the production of a tank in which the joints between the parts thereof contain two calking edges and rows of rivets on the inside of the tank and outside thereof. The tank is also characterized by such a disposition of its parts that variations of temperature will expand or contract said parts uniformly, and thereby avoid leakage.

In the drawings, Figure 1 represents the front elevation of a tank illustrative of the invention. Fig. 2 shows a top view of Fig. 1. Fig. 3 is a section of Fig. 1 on the line a1, and Fig. 4 shows an end view of Fig. 1.

The tank is made by shaping an I-beam A to constitute the bottom and ends thereof and then riveting to the outer faces A of the flanges of said beam the plates B with two rows of rivets A A to form the sides of the tank. One row of the rivets clenches one of the sides with the I-beam on the inside of the tank and the second row on the outside thereof.

In the drawings the I-beam A is shown with the horizontal parallel steps (I/ a, connected by the inclined portion (f. The steps are bent up at their ends to form the perpendicular ends a (0* of the tank. By this disposition of the parts a calking edge B is formed in the inside and a second calking edge B is formed on the outside of the tank.

On account of the extra thickness of the double flanges of the I-beam the tank is of unusual strength. In tanks made by bending sheets the bending process causes a thinness at the curve, and therefore weakens the whole tank, cracks being liable to occur at the weakest portions, while with an I-beam the greatest thickness and strength are at the flange, which corresponds in position in the tank to that occupied by the weakened curve in the flange of a flanged plate.

I am aware that metal-coating tanks have been constructed whose bottom and ends are composed of a single flanged plate to which other plates are attached by two rows of rivets to form the sides, the rivets being either on the inside or on the outside, according as the flange of the bottom plate is turned inwardly or outwardly; but my invention is an improvement over these constructions. In the former construction when the flange is turned outwardly there is only one calkingjoint, and if the flange be turned inwardly then in time the chemical action of the contained metal weakens the rivets, while my invention results in a row of rivets on the outside of unimpaired strength and at the same time in giving two calking-joints. It is possible to attain all these results in my construction, because the bottom of the tank being an I-beam is provided at its edges with a double flange, whereas in the former construction there is only a single flange around the edges of the bottom.

Another important point gained by my improved construction is the much lessened cost of manufacture.

As hitherto constructed therewas increased cost incidental to the flanging of the plates for the bottoms, while in my invention the I-beam used for the tank-bottom is itself a staple article of commerce which is easily bent to shape to form the bottom and ends of the tank, and thus the cost of manufacture is much reduced, as well as a better tank produced.

Having described my invention, I claim- 1. A metal-coating tank comprising a bottom having two horizontal steps; an inclined portion connecting the said steps; vertical ends of the tank formed with and extending from the bottom thereof; plates facing the vertical outer faces of the bottom and ends; a row of rivets on the inside of the tank connecting the bottom, ends and sides; a second row of rivets connecting the said bottom and ends with said sides on the outside of the tank; forming thereby a calking edge on the inside, and a second calking edge on the outside of the tank.

2. A metal-coating tank comprising a bottom made of an I-beam, two horizontal steps formed in said beam, an inclined portion connecting the said steps, vertical ends for the tank extending from the steps, plates facing the vertical end faces of the flanges of the 1-- beain, a double row of rivets connecting the said flanges and the said plates, forming a calking edge on the inside of the tank, and a second calking edge on the outside of the tank.

3. A metal-coating tank consisting of the combination of an Lbeam, bent to form the bottom and ends of the tank, plates for the sides of the tank, the said plates bearing against the outside of the flanges of the I-beam, rivets by which the said plates are secured to the said flanges, the said rivets being disposed in two rows, one row within and one beyond the bottom and ends of thetank.

4L. A galvanizing -tank comprising an I- beam for its bottom and ends, plates bearing againstthe outside faces of the flanges of the Lbeam, and two rows of. rivets connecting the flanges of thc I-beam and the plates, one of said rows being in each flange of the lt-bcam.

5. A metal-coating tank comprising a bottom made of an I-bearn, vertical ends for the tank formed integral with and extending from the bottom thereof, plates facing the vertical end faces of the flanges of the li-beam, a double row of rivets connecting the said flanges and the said plates, whereby a calking edge is formed on the inside of said tank and a second calking edge is formed on the outside thereof, one of said rows of rivets being at the inside of said tank in one of said flanges, and the other said row being in the opposite flange and at the outside of said tank.

6. A metal-coating tank consisting of the combination of side Walls opposite each other, bottom and end walls connecting said side walls, flanges extending from the bottom and ends against the inside surfaces of said side walls and riveted to the latter to form a calking-joint, an extension of the side walls beyond the bottom and ends, and asecond flange extending from the bottom and ends against and riveted to the said extended side walls to form a second calking-joint.

Signed this 27th day of May, 1904.

GEORGE PORTER. lVitnesses:

L. E. Hicks, EDWARD P. THoMrsoN. 

